Turbine.



PATENTED JULY 5, 1904.

0. JUNGGREN.

TURBINE.

APPLIUATION FILED 1:20.13, 1003.

N0 MODEL Inventor: Oscar d Linggren,

UNITED STATES Patented July 5, 1904..

PATENT OFFICE.

OSCAR JUNGGREN, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NE YORK.

TURBINE.

SPECIFICATION forming part of Letters Patent No. 764,471, dated July 5, 1904.

Application filed December 18, 1903. Serial No. 185,665

To rtZZ whom it may concern.-

Be it known that I, OSCAR JUNeeREN, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New 5 York, have invented certain new and useful Improvements in Means for Preventing Accidental Rubbing Between the Moving and Stationary Parts of a Turbine, of which the following is a specification.

I In turbines, and more especially those of the elastic-fluid type, the buckets are liable under abnormal conditions to be injured when moving at relatively high speed by contacting with each other or with a nozzle or other sta- I tionary part of the machine. These buckets are usually of special and costly formation and constitute what maybe termed the lighter and more delicate parts of the organization. The contacting of the relatively moving parts may be due to accident or improper handling; but

the results are the same.

1t is the object of the present invention to provide a means normally inoperative whereby accidental contact or engagement between 5 normally separated working parts is prevented.

1n carrying out my invention one or more limiting devices or stops are provided of a robust character which may be carried by the 3 casing or other support and are normally inoperative, but come into service when a given clearance is reduced by a predetermined amount. The particular construction of the said device or devices may be varied within wide limits without departing :from the spirit of my invention. It may be mounted on the casing and arranged to engage some part of the wheel or wheels other than the buckets themselves, or it may be carried by a wheel 4 or rotating part and arranged to contact or engage with a suitable surface which is maintained in a given position at all times.

As an illustration of the invention, the limiting device may be supported on the wheelcasing and extend to the flange of the wheel and be separated therefrom by a clearance which is less than that between any two adjacent rows of buckets, or it may be less than the clearance between a nozzle or nozzles and (N0 niedeLl the wheel-buckets if it be desired to prevent 5 rubbing at that point. The main thing is to provide some means normally inoperative which comes into service before the more delicate parts are injured and either stops the turbine or gives such an audible signal that the attention of the engineer will be attracted. These devices may be adjustable and removable, as desired, and can be located at any convenient point or points around the wheel.

Since the wheel-buckets are usually located either between a nozzle and a row of intermediate buckets or between rows of intermediate buckets, it is important to prevent them from engaging either on one side or the other. This is accomplished by providingtwo or more 5 limiting devices arranged above and below the wheel in a vertical machine and on each side thereof in a horizontal machine. In this case, as before, the clearance between each limiting device and the moving body should be less 7 than the clearance between the relatively movable parts to be protected.

In the accompanying drawings, which illustrate one embodiment of my invention, Figure 1 is a partial horizontal section of a vertical turbine. Fig. 2 is a partial vertical section of the same, and Fig. 3 is a detail view of a modified form of the limiting device.

1 represents awheel which is provided with one or more rows of peripheral buckets 2. 30 When more than a single row of wheel-buckets is provided, suitable means, such as intermediate buckcts 3, are situated between the adjacent rows of wheel-buckets and receive fluid from one row of buckets and discharge 5 4 it at a proper angle against the next. The buckets may be supported in any suitable manner. In the present illustration they are attached to a common support 4, which extends through an opening 5, formed in the 9 wheel-casing 6. The support f is provided with an enlarged flange which is bolted to the Wheel-easing and may be adjusted in a direction parallel to the wheel-shaft for the purpose of varying the clearances between the relatively moving buckets. As many sets of intermediate buckets are employed as are necessary, which are preferably situated at equidistant points around the periphery of the wheel. Situated above the wheel is a limiting device 7, comprising in the present illustration a projection which extends inwardly over the wheel-flange and a head or flange 8, that engages with the casing of the turbine. The support extends through an opening in the casing that is slightly larger than the projection, so that the latter can be moved toward or away from the wheel-flange in order to vary the clearance 9. The projection is held in place by bolts 10, the bodies of which are separated from the surrounding metal by a slight space to permit of the projection being adjusted in a direction parallel with the wheel-shaft. Other adjusting devices may be employed, if desired. The clearance 9 between the wheel and the projection should be less than the clearance or clearances 11 between the buckets or between the buckets and nozzle 14, so that when the wheel moves upward independently of the casing,

due to any cause, the enlarged end face of the limiting device will engage with the wheel and prevent the buckets from engaging. Situated below the limiting device 7 is a second limiting device 12, which is of the same construction as the one previously described, and the clearance between it and the wheel is less than that between the nozzle and wheel-bucket or between adjacent rows of wheel-buckets. These limiting devices are adjustable independently of each other for the purpose of obtaining the proper relation of the parts. In the drawings one limiting device is shown above the other; but this arrangement need not necessarily be followed. I find it preferable to distribute these limiting devices at equidistant points around the bucket-wheel, so as to equalize the strains in case they come into engagement therewith. A satisfactory arrangement is to place a pair of limiting devices between two sets of intermediate buckets.

In Fig. 3 I have shown a slight modification wherein the limiting devices 7 and 12, instead of being independently adjustable, are formed in a single piece, while the piece as a whole is adjustable in a direction parallel to the wheel-shaft. The space between the contacting surfaces 13 is slightly greater than the width of the rim or flange of the wheel.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. A turbine comprising relatively movable working parts with a means normally inoperative for preventing said parts from accidentally engaging.

. 2. A turbine comprising relatively movable working parts with a device which is normally inoperative but engages one of the said parts under abnormal operating conditions to prevent the said parts from engaging with each other.

3. A turbine comprising a moving bucketwheel and means for discharging fluid against the bucket in combination with a limiting device which under abnormal conditions engages with the wheel to prevent accidental engagement of the buckets between it and said means.

4. A turbine comprising relatively movable working parts arranged in a line, with ameans for preventing said parts from accidental engagement due to longitudinal movement in either direction from the normal position.

5. A turbine comprising relatively movable parts which are separated by a predetermined clearance, with a limiting device which is separated from one of the parts by a clearance which is less than that between said parts.

6. .A turbine comprising rows of relatively movable buckets, which are separated by a predetermined clearance, with a limiting device which is normally inoperative and is separated from the buckets by clearances which are less than that between the buckets themselves for preventing engagement of the buckets.

7. A turbine comprising wheel-buckets and stationary intermediate buckets, the said buckets being separated by a predetermined clearance, with stationary limiting devices which are in line with the wheel and are separated from it by clearances which are less than those between the buckets.

8. A turbine comprising relatively movable and stationary working parts which are separated by a clearance, in combination with an adjustable limiting device which is normally separated from one of the parts by a clearance which is less than that between the working parts.

9. A turbine comprising relatively movable and stationary working parts which are separated by a clearance, and an inclosing casing, in combination with a normally inoperative and adjustable limiting device for preventing accidental engagement of the said parts, which is carried by the casing.

10. A turbine comprising relatively movable and stationary working parts which are separated by a clearance, and an inclosing casing, in combination with an adjustable limiting device which is separated from one of the parts by a clearance which is less than that between said parts, and a means for adjusting the limiting device from a point outside of the casing.

11. In a turbine the combination of a nozzle, wheel buckets, intermediate buckets, means for adjusting the intermediates, and a limiting device which is separated from the rotary member of the turbine by a clearance which is less than that between the working parts.

In witness whereof I have hereunto set my hand this 14th day of December, 1903.

' OSCAR J UNGGREN.

IVitnesses:

P. D. TOWNSEND, N. P. ZEOK. 

